̸̸Java¼Ì³ÐÖеÄÖØÔØ£¬¸²¸ÇºÍÒþ²Ø
̸̸Java¼Ì³ÐÖеÄÖØÔØ£¬¸²¸ÇºÍÒþ²Ø
ºÃ¾Ã²»Ð´²©¿ÍÁË£¬¾àÀëÉÏһƪÒѾ¹ýÁËÁ½Äê¶àÁË¡£ÕâÁ½ÄêÔÚ¸ÉÂï,×ÜÖ®Ò»ÄêÄѾ¡£¡
Ç°Ò»¶Îʱ¼äæÁËÁ½¸öÔ£¬Ã¦×ÅÑо¿ºÍ×öһЩSSH¼Ü¹¹µÄ¶«Î÷£¬Á½¸öÔÂÏÂÀ´£¬ÊÕ»ñÆķᣬ×î½üÏÐÏÂÀ´ÁË£¬ÓÚÊǾÍÍ´¿ìµÄ¿ªÊ¼ÍæÓÎÏ·£¬µ«ÊDz»ÖªÔõôµØ£¬ÔõôÍ涼ûÒâ˼£¬ÓÚÊǾö¶¨¿ªÊ¼ÔٺúÃÑо¿Ñо¿Java°É¡£ÓÚÊÇ´ó¸Å·ÁË·¡¶Thinking in Java¡·¡£
»¹ÊǾõµÃ°ÑÐĵÃдÏÂÀ´±È½ÏºÃ£¬Ò»·½Ãæ¼ÓÉîÀí½â£¬ÁíÒ»·½Ã棬Äê¼Í´óÁË£¬¼ÇÐÔ²»ºÃÁË£¬¼Ç²»×¡¹Ø¼üµÄ£¬“ºÃ¼ÇÐÔ²»ÈçÀñÊÍ·”£¬¸üºÎ¿öÎÒ¼ÇÐÔ²»ºÃÄØ£¿Ð´²©¿ÍÊÇΪÁË×Ô¼ºÑ§Ï°Ê¹Óã¬Ç°¼¸Ìì¿´µ½×Ô¼º²©¿ÍÀïµÄÎÄÕÂÔÚ±ðµÄÍøÕ¾»òÕß±ðÈ˵IJ©¿ÍתÔØ»¹²»Ð´³ö´¦£¬ÓÚÊÇÐÄÀí²»Êæ·þ£¬ËùÒÔÇ¿µ÷һϣ¬×ªÔØÇë×¢Ã÷³ö´¦-¼´×ªÔØ×ÔhandsomerunµÄCSDN²©¿Í¡£
ºÃ£¬ÇÐÈëÕýÌ⣬²î²»¶à4ÄêÇ°£¬Ð´¹ýһƪ¡¶Ì¸Ì¸C++¼Ì³ÐÖеÄÖØÔØ£¬¸²¸ÇºÍÒþ²Ø¡·£¨http://blog.csdn.net/handsomerun/archive/2006/04/23/674210.aspx£©£¬Í¬ÑùÄ¿µÄÒ²ÊÇΪÁ˼ÓÉî×Ô¼ºµÄÀí½â£¬ÎÒÊÇÒ»¸öºÜϲ»¶C/C++µÄÈË£¬Ñ§Ï°JavaµÄʱºò£¬¾Í²»ÓɵúÍÄÃJavaºÍC++½øÐбȽϣ¬ºÍдC++µÄÄÇƪ½ãÃÃƪһÑù£¬»¹µÃÏȰѶ¨Òå·ÒëһϣºÖØÔØ(overload)£¬¸²¸Ç(override),Òþ²Ø(hide)¡£ÎÒ¿´Ò»±¾·Òë¹ýÀ´µÄ¡¶Thinking in Java¡·µÄʱºò£¬¿´µ½Ëû°Ñoverride·Òë³ÉÖØÔغÜÊÇÓôÃÆ£¬ËùÒÔ£¬ºÜ¶àʱºò£¬½áºÏÓ¢ÎÄ°æÒÔ¼°ºî½Ý°æÒ»Æð¿´¡£
1. JavaÖÐûÓÐÒþ²Ø
ÔÚ¡¶Ì¸Ì¸C++¼Ì³ÐÖеÄÖØÔØ£¬¸²¸ÇºÍÒþ²Ø¡·ÖУ¬ÎÒ¸ø³öÁËÒþ²ØµÄ¶¨Òå¡£µ«ÊÇJava¸ù±¾¾ÍûÓÐÕâ¸öÒþ²ØµÄ¸ÅÄ»ùÀàÖеĺ¯Êý£¬»á¼Ì³ÐÏÂÀ´£¬ºÍ¼Ì³ÐÀàÖеÄͬÃûº¯Êý£¬Ò»Æð³ÉΪ¼Ì³ÐÀàµÄÖØÔغ¯Êý¡£
Çë¿´Àý×Ó£º
class CB {
public void f(){
System.out.println("CB::f()");
}
}
class CD extends CB {
public void f(int a){
System.out.println("CD::f(int)");
}
}
public class MyTest {
public static void main(String args[])
{
System.out.println("helloWorld");
CD test = new CD();
test.f();
test.f(1);
Ïà¹ØÎĵµ£º
Problem: email thread is hanging at socket read
Today we found a email problem in production, all of the mail threads (3 threads) are hanging/sitting/blocking at same point
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
......
javaµÄ·¶ÐÍ»úÖÆ¿´ÆðÀ´ÓеãÏñC++µÄÄ£°æ£¬µ«Ïà±È½ÏC++µÄÄ£°æÀ࣬javaÖеķ¶ÐÍûÓйؼü×Ötemplate£¬²¢ÇÒÓÐ×Ų»Í¬µÄʵÏÖ»úÖÆ£¨±¾ÖÊÇø±ð£©¡£
·¶ÐÍÀà
ÏÈ¿´Ò»¸ö·¶ÐÍÀàµÄÀý×Ó£º
public class Demo1<T> {
private T value;
public Demo1(T value) {
&n ......
¶ÔÏó³Ö¾Ã»¯£¬Ò²¾ÍÊÇ¿ÉÒÔ°ÑÕâ¸ö¶ÔÏóÓÀÔ¶µÄ±£´æÆðÀ´£¬ÕâÀïµÄ±£´æ²»½öÊǶÔÏó±¾Éí£¬»¹°üÀ¨ËûµÄÊôÐÔºÍËùÒÀÀµµÄÆäËûÀࡣͨ³££¬¶ÔÏó¿ÉÒԳ־û¯µ½Îļþ»òÕßÊÇÊý¾Ý¿âÖС£ÎÒÕâÀïÖ»½éÉÜÈçºÎ½«¶ÔÏó´æ´¢µ½Êý¾Ý¿âÖС£Ç¡ÇÉOracleÊý¾Ý¿âΪÎÒÃÇÌṩÁËÕâÑùµÄ·½±ã¡£
ÔÚOracleÖУ¬ÓÐÒ»ÖÖblogµÄ×Ö¶ÎÀàÐÍ£¬ËüÊÇÓÃÀ´´æ´¢´óÁ¿µÄ¶ ......
ÕâƪÎÄÕ²»ÊǶÔprivate£¬public£¬protected½øÐÐ˵Ã÷£¬Ö»ÒªÑ§¹ýÃæÏò¶ÔÏóµÄ³ÌÐòÉè¼Æ£¬¶ÔÒÔÉÏÈý¸ö¹Ø¼üÔÙÊìϤ²»¹ýÁË¡£ÕâÀïҪ˵µÄÊÇÁíÍâÁ½¸ö¹Ø¼ü×Ö---staticºÍfinal¡£
1. static¹Ø¼ü×Ö
ÔÚÎÒÃÇ´´½¨Ò»¸öÀàµÄʵÀýʱ£¨¶ÔÏ󣩣¬Í¨³£Ê¹ÓÃnew·½·¨£¬ÕâÑùÕâ¸öÀàµÄÊý¾Ý¿Õ¼ä²Å»á±»´´½¨£¬Æä·½·¨²ÅÄܱ»µ÷Óá£
& ......
Ðí¶àʱºòÎÒÃÇÐèÒªÓõ½Ïß³Ì ±ÈÈçÏ£ÍûÒ»¸ö¸½¼ÓµÄ¹¦ÄÜ ²»ÒªÓ°ÏìÕû¸öÁ÷³ÌµÄ¹¦ÄÜ£¬±ÈÈçij¸öÁ÷³ÌÐèÒª¼ÓÈëÈÕÖ¾£¬µ«ÊDz»Ï£Íû¼Ç¼ÈÕÖ¾µÄ¹¦ÄÜÓ°ÏìÕû¸öÁ÷³ÌµÄÐÔÄÜ£¬²»ÄÜÒòΪ¼Ç¼ÈÕÖ¾°ÑÕû¸öÁ÷³Ì¸ø¿¨×¡ÁË¡£ÔÚÕâ¸öÖÖÇé¿öÏ£¬ÎÒÃÇÐèҪʹÓÃÏ̡߳£ÈüǼÈÕÖ¾ÔÚµ¥¶ÀÒ»¸öÏß³ÌÀïÃæÅÜ£¬¾Í²»»áÓ°Ï춼ÆäËûÁ÷³ÌÁË¡£
  ......